Repairing water damage on Chalet Aspen roof panel

Hello,
We have a 1994 Chalet Aspen A-Frame camper that has had some water leaks around the fan and around one of the skylights. The outside/top looks fine, but inside there is some soft wood, and the wallpaper (whatever it is on the luan wood panel) is peeling. Any ideas how to repair the luan plywood? I am assuming it is glued to the interior insulation.
Thanks for your time.
I will try to post some pics later today.
I have done a search Chalet on this forum and nothing useful came up.